Wells – Processes – Distinct – separate injection and producing wells
Patent
1984-11-29
1986-08-19
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166274, 166275, E21B 33138
Patent
active
046064079
ABSTRACT:
Polymers used for the control of permeability in stratified subterranean formations are gelled in a controlled manner by the use of rapid and delayed gelling agents. The polymer is first gelled lightly by the use of a rapid gelling agent which partly cross-links the polymer to produce a viscous solution which will selectively enter only the more permeable regions of the formation but can still be readily injected. A delayed cross-linking agent completes the cross-linking process after the polymer has been selectively emplaced to form a firm, full strength gel. Suitable rapid cross-linking agents may be formed by the reaction of alkalies and chromic salts at specified ratios or by the redox reduction of chromium from its higher oxidation states under certain specified conditions. Delayed cross-linking agents are exemplified by chromic salts. Polymers which may be used include polyacrylamides and polysaccharide biopolymers.
REFERENCES:
patent: 3208518 (1965-09-01), Patton
patent: 3749172 (1973-07-01), Hessert et al.
patent: 3981363 (1976-09-01), Gall
patent: 4040484 (1977-08-01), Hessert
patent: 4488601 (1984-12-01), Hammett
patent: 4574887 (1986-03-01), Abdo
Aksman Stanislaus
Gilman Michael G.
McKillop Alexander J.
Mobil Oil Corporation
Novosad Stephen J.
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